Follow Us On:

Your Result is copied!

Reticulocyte Index Calculator

Enter reticulocyte and hematocrit percentage and the calculator will estimate the reticulocyte index present in a patient’s body.


Add this calculator to your site


The Reticulocyte Index Calculator is an online tool that provides a precise assessment of the reticulocyte index in the blood of the patient. It is calculated correspondingly to the raw RC, but, in order to avoid misapprehension in patients, the outcome is modified using a coefficient. If you read on, you can study the RIC formula and procedure of interpretation.

Evidence-Based Studies Regarding Reticulocyte Index

According to the research “Clinical Utility of Reticulocyte Parameters” which was conducted in 2014, it was revealed that the standard RC explains the erythropoietin action of bone marrow in human beings. It is why it is beneficial for the diagnosis of anemia and checking the response of human bone marrow because of the therapy as it contributed towards the corrected reticulocyte count. On the other hand, absolute reticulocyte count was considered as an RBC production.

RPI calculator has led to a noteworthy improvement in its counting, by concurrently providing precise parameters about Hematocrit. Furthermore, via such calculators,’ maturation can also be assessed. RH content is valuable in measuring the useful iron available for erythropoiesis. Whereas, the volume of reticulocyte is a useful pointer while monitoring the therapeutic response. Furthermore, the researchers concluded that High reticulocyte count represents more red blood cells are being prepared by the bone marrow. The reason could be a lot of bleeding, going towards high altitude, or different types of anemia.

About Reticulocyte Index:

The reticulocyte production index is also said to be as a corrected reticulocyte count, it is a calculated value that is used in the diagnosis of anemia. However, this calculation is immensely important as the raw reticulocyte count is misleading in anemic patients.

In fact, the Reticulocyte Index and Absolute Reticulocyte Count will assess appropriate response to anemia, frequently in Sickle Cell Disease patients. The problematic situation occurs because it is not indeed a count but somewhat a proportion. For measuring purposes, reticulocyte index calculators are highly recommended. Read on!

Normal and Corrected Reticulocyte Count

Normal and corrected reticulocyte count (CRC), also referred to as RI. In the simplest form, it is known as a limitation in order to explain the response of bone marrow assessment that is used in the diagnosis of anemia. If the person is in a good health condition, then the RI should be between 0.5% and 2.5%.

Decreased Reticulocytes

If the patient is suffering from the anemia his hemoglobin levels will be less than 13 to 14 g/dL in men and 12 to 13 g/dL in women. It means that the production of reticulocytes has been decreased.

Nutritious Insufficiencies:

All those patients who have an inappropriate marrow reaction should be further estimated for the identification of various nutritious insufficiencies or several types of bone marrow irregularities because they will not represent reticulocyte count normal range.

CRC More Than 3%

whereas CRC, that is more than 3% in a person who is diagnosed with anemia labels potential loss of red blood cells (from different reasons such as annihilation, bleeding, etc.).

Reticulocyte Production Index Formula

As formulas assist human beings in performing many tasks automatically in less time with less effort therefore here is a glimpse of reticulocyte production index formula. The CRC can be calculated with the help of using a very simple equation as described below:

CRC = (Hematocrit / normal Hematocrit) x (Reticulocytes / Maturation)


A value of 45% is used to indicate normal Hematocrit. Still, if you observe a calculator, it offers an advanced mode so that value of 45% can be altered via it. Moreover, maturation is a constant measurement that is used to define the lifecycle of impulsively free reticulocytes in the blood. This is the phenomenon that is responsible for an increase in the production of RBC in the human body.

  • This factor equals 1.0 for a hematocrit of 36-45%,
  • 1.5 for a hematocrit of 26-35%,
  • 2.0 for a hematocrit of 25-16%,
  • 2.5 for a hematocrit of 15% or lower.

By clicking the advanced mode in the calculator, you can quickly look for the assigned value.

About Reticulocyte Index Calculator:

RPI calculator is a health tool that is planned to figure out normal reticulocyte count. It works on a specific procedure that is based on some constant values. It has the ability to assist you in the assessment of a suitable response to anemia.

This reticulocyte index calculator fundamentally has dual tabs in order to be accommodating both:

  • to those who are trying to find out RPI expressing the hematocrit value.
  • To those who are well aware of the value of the hemoglobin.

How to Use This Reticulocyte Index Calculator?

  • You just have to enter the patient’s Hematocrit (HCT) level in into the designated field.
  • Now enter the level of reticulocyte count into the designated box
  • Very next, you have to enter Normal hematocrit (HCT) into the given field
  • Finally, hit the calculate button, the calculator shows Absolute Reticulocyte Count, Reticulocyte Index and tells about Hypoproliferation/Adequate response according to your Reticulocyte Index

For Instance:

This method of RPI calculator needs an accurate percentage of reticulocytes from red blood cells. The second thing that is required by the calculator is the hematocrit value. And the last requirement is the normal Hematocrit – this is typically accounted as 45 percent.

Now there are two steps of the formula that you have to follow:

  • In the first step, you need to compute the reticulocyte index.
  • After computing, you have to correct it in order to reflect on their life span.
  • Reticulocyte Index = Reticulocyte count x Hematocrit / Normal Hematocrit
  • RPI = Reticulocyte index/ Maturation correction

The alteration rates used are clarified below:

Hematocrit (%) Maturation correction
<15 2.5
16 - 25 2
26 – 35 1.5
36 – 45 1

Let’s take the example of a person who has a reti. count = 3.5%. Hematocrit value of 30%, the RPI value is = Reticulocyte count x Hematocrit / Normal Hematocrit / Maturation correction = 3.5 x 30 / 45 / 1.5. In such scenario the result will be:

  • Reticulocyte Production Index (RPI) is 1.56.
  • The absolute Reticulocyte count is 2.33.
  • Retic persistence (days)/ Maturation improvement centered on Hematocrit (%) is 2.

Reticulocyte Production Index (RPI) Methods Interpretation and Its Calculations

  • The standard range of the absolute RC is 0.5 to 2.5%.
  • RI that is lower than 2, accompanied by anemia is an indication of red blood cell loss and reduced production of reticulocytes.
  • If the results are greater than 3 accompanied by anemia, then it suggests the loss of red blood cells but an increase in the production of reticulocytes.

What Happens in A Reticulocyte Count Test?

It is a routine test in a hematology research laboratory. It can be completed by manually counting of the reticulocytes on marginal blood smear-stained with fresh methylene blue. This technique is easy to execute, and many laboratories prefer it. The basic purpose of reticulocyte count test is to identify the normal reticulocyte count that is 0.5% to 2.5% in the case of adults and 2% to 6% considered normal in the case of a child.


What does reticulocyte count indicate?

Health care providers accounts it to find out whether an individual has a certain types of illness that affects his/her blood like hemolytic anemia (it is said to be a condition in which red blood cells are destroyed faster than they can be develop.

Is reticulocyte count included in CBC?

Optimistic studies reveal that the CBD may also include reticulocyte count, which is said to be a measurement of the absolute count or percentage of newly released young red blood cells in the sample blood.

Which condition is associated with an elevated reticulocyte count?

Hemolytic anemia is the condition that is associated with an elevated reticulocyte count. This is the condition in which anemia is caused by increased destruction of RBCs. The bone marrow increases RBC production to compensate that resulting in a high reticulocyte count. Hemolytic disease of the newborn – this is the condition which causes increased RBC destruction, similar to hemolytic anemia that mentioned-above!

How do you fix reticulocyte count?

Reticulocytes leave the marrow early and last longer in the peripheral blood of patients with severe anemia. To correct this, all you need to divide the reticulocyte count in half if the HGB is less than – and the HCT less than 30!

What is the standard reticulocyte index?

It is essential that the RI must be between 0.5% and 2.5% for a healthy individual.

What is absolute reticulocyte count?

The absolute reticulocyte count is 120 thou/µL (8/100 x 1.5 x 1000 or 8 x 1.5 x 10), which specifies a mild recovering response.

How do you fix a reticulocyte count?

The corrected reticulocyte counts = reticulocyte % x (Hgb/15). This formula “corrects” for hemoglobin .it means that via it, we can observe that if the patient is producing enough reticulocytes for the degree of anemia present.

What is the reticulocyte crisis?

Reticulocytopenia that is also known as Aplastic crisis or a Marrow failure is the medical term for an atypical reduction of reticulocytes in the human body.

What causes Reticulocytosis?

Reticulocytosis may be caused because of blood loss or hemolysis. Long-term intakes of alcohol can also be the cause of this condition. Basically, it is associated with the conditions of anemia.

Is hemolytic anemia a form of cancer?

Many types of cancers, such as leukemia can cause anemia as it affects the production of blood in the bone marrow. Their effects may vary from insignificant to life-threatening.


A corrected reticulocyte count calculator has the ability to provide assistance to your doctor. It might be beneficial to identify the number of red blood cells produced by the bone marrow. This tool is beneficial for all those researchers who are studying protein translations. The most beautiful thing is its online availability without any cost. Furthermore, a reticulocyte index can guide you towards making an analysis and diagnosis of many different conditions, such as:

  • Anemia
  • Failure of bone marrow. It can monitor your progress and health after chemotherapy, radiation therapy, a bone marrow transplant, or treatment for iron deficiency.

The normal reticulocyte count in children and older infants is different from 1% to 2% of the circulating red cells. It takes about 2-3 days to mature to an RBC and starts circulating a day before complete maturation. There are about 1% reticulocytes in the blood as RBCs remain active for 120 days during circulation.


The authors of calculator-online makes no claim on the information that contained here-in, the results or estimations you get from this calculator is just account for educational or informational purposes. For serious health condition, it is better to visit to your MEDICAL PRO!


From Wikipedia, the free encyclopedia - Not to be confused with reticular cell - Clinical significance- Development - Reserach  - about normal Reticulocyte Count

From The Source of webmd - What is a Reticulocyte Count Test - reticulocyte index – or “retic count” for short

From Healthline - corrected reticulocyte count (all you need to know) Medically reviewed by Deborah Weatherspoon, PhD, RN, CRNA on June 28, 2017 — Written by Amber Erickson Gabbey From sciencedirect - absolute reticulocyte count - Congenital and Acquired Bone Marrow Failure, 2017 - Pallor and Anemia- Amanda M. Brandow, in Nelson Pediatric Symptom-Based Diagnosis, 2018 -  Classification and Diagnosis of Anemia in Children -  

Online Calculator



Get the ease of calculating anything from the source of calculator online

© Copyrights 2024 by