The estimated glomerular filtration rate assesses the filtration function of the kidneys and is calculated from some basic laboratory and demographic data.

a. MDRD formula

eGFR = 175 x [Screat]-1,154 x [age]-0,203 x [0,742 for female x [1,21 for black race]])

b. CKD-EPI formula

Caucasian female:
eGFR = 144 × [Screat/0,7]a × 0,993age
a = –0,329 for Screat ≤0,7 (mg/dl)
a = –1,209 for Screat >0,7 (mg/dl)

Caucasian male:
eGFR = 141 × [Screat/0,9]a × 0,993age
a = –0,411 for Screat ≤0,9 (mg/dl)
a = –1,209 for Screat >0,9 (mg/dl)

c. Cockcroft and Gault formula

It is used to determine the correct body weight, underweight, overweight and obesity. creat x 72
For women, the value obtained should be multiplied by 0.85

d. Schwartz's formula

Assessment of eGFR in children
eGFR [ml / min / 1.73 m2] = 0.413 x body height [cm] / Screat [mg/dl]
≥ 90 normal to increased GFR
60-89 slight reduction in GFR
45-59 slight to moderate reduction in GFR
30-44 moderate to severe reduction in GFR
15-29 severe reduction in GFR
<15 end-stage renal disease

Standard Kt/V (stdKt/V)

Equation for Estimation of Standard Kt/V (stdKt/V)

Single-pool Kt/V

Equation I

spKt / V = − ln ( C 1 / C 0 − 0,008 ∗ t ) + ( 4 − 3,5 ∗ C 1 / C 0 ) ∗ UF/ WspKt/V=-ja(do1/do0-0,008*t)+(4-3,5*do1/do0)*UF/W

where C0 is pre-dialysis BUN (in milligrams per decilitre),
C1 is the post-dialysis BUN (in milligrams per decilitre),
t is session length in hours,
UF is the ultrafiltrate in kilograms
W is post-dialysis weight in kilograms.


Iron transferrin saturation (TSAT) – iron availability for current erythropoiesis
TSAT = Serum Fe concentration × 100/Total Fe binding capacity (TIBC)
Iron deficiency TSAT <20%
Target value> 30%

TSAT calculator


The body mass index (BMI) is calculated by dividing body weight (kg) by the square of body height (m). The classification (value range) for BMI has been developed for adults only and must not be used for children.

BMI calculator

The classification (value range) for BMI has been developed for adults only and must not be used for children.
BMI(kg/m2) Body weight Category The risk of obesity accompanying diseases
< 16,0 underweight starvation At minimum but increased levels of other health problems
16,0-16,99 emaciation
17,0-18,49 underweight
18,5-24,99 optimum desired body weight minimal
25,00-29,99 overweight overweight average
30,00-34,99 obesity 1st degree obesity high
35,0-39,99 2nd degree obesity (high) very high
≥ 40,0 3rd degree obesity (pathological) extreme level of risk

HOMA index

The basic test in the diagnosis of insulin resistance is the determination of fasting glucose and insulin levels in the blood serum. Based on these values, the so-called HOMA-IR indicator (Homeostatic Model Assessment – Insulin Resistance) is calculated. It is calculated on the basis of the following formula:
HOMA-IR = fasting insulin mU/ml × fasting glucose (mmol/l)/22.5.

Interpretation of the result:
2,5 - normal
2.5 – 4.0 suspected insulin resistance

HOMA indicator calculator

Modified Early Warning Score

MEWS – Modified Early Warning Scoring. It is used to identify patients at risk of deterioration of the general condition that may be a threat to patients health or life. It is an element of the assessment of risk of ICU hospitalisation and death.

0-2 – routine care
3 – the need for increased watchfulness in care, assessment of the condition every 2 hours,
4 – constant monitoring of vital signs, including a pulseoximeter
> or = 5 – call an anaesthesiologist to assess indications for transfer to ICU

MEWS calculator

Find a dialysis centre near you

Here you will find contact details and information about the opening hours of dialysis centres in your area.


Medical calculators

Simple medical calculators to check various parameters of your health.