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Free Health Calculators & Diagnostic Test Education Hub

Evidence-based clinical calculators, pathology test analyzers, unit converters, and medical student learning tools.

For Educational & Informational Purposes Only Student & Patient Learning Modes
International Clinical Safety Disclaimer (For Information Only):

These calculation and diagnostic educational tools provide estimations based on international clinical guidelines (WHO, CDC, AHA, ACOG, ADA, KDIGO, and ICMR). They do not constitute medical diagnosis, treatment, or prescription. Never start, stop, or alter medications without consulting a qualified physician. Always compare blood test results with the exact reference ranges printed by your specific pathology laboratory.

View Mode: Toggle learning depth for Patients or Medical Students

Hemoglobin, RBC Indices & Mentzer Index Calculator

Evaluates Hemoglobin levels, MCV, MCH, MCHC, and Mentzer Index to differentiate Thalassemia trait from Iron Deficiency.

Hemoglobin Level Status

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Category
Low (Anemia) Normal Range High (Polycythemia)
Low
Normal
High
Mentzer Index Analysis (MCV / RBC):
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Enter both MCV and RBC count to calculate Mentzer Index.

Student Medical Formula & Viva Tips:
Mentzer Index Formula: Mentzer Index = MCV (fL) / RBC Count (million/µL) Clinical Rule: If Mentzer Index < 13 → High probability of Thalassemia Trait. If > 13 → High probability of Iron Deficiency Anemia.

Complete Blood Count (CBC) Educational Analyzer

Evaluates Red Cells, White Cells, Platelets, and Differential Counts against lab reference bands.

CBC Educational Interpretation Summary
What Doctors May Consider Next:

Always compare with your lab's reference range. Further tests may include Peripheral Blood Smear, Serum Ferritin, or CRP.

ABO & Rh Blood Group Transfusion Compatibility

Visual compatibility matrices for Red Blood Cells (RBC) and Plasma transfusions.

Universal Rules O Negative: Universal Red Cell Donor
AB Positive: Universal Plasma Donor
Can Receive Red Blood Cells From:
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Can Donate Red Blood Cells To:
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Clinical Transfusion Warning: Actual blood transfusions require crossmatching, antibody screening, and blood bank verification by qualified medical staff.

Iron Profile & Transferrin Saturation (TSAT %) Calculator

Calculates Transferrin Saturation percentage (Serum Iron / TIBC * 100) and interprets Ferritin levels.

Calculated TSAT Percentage

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Dietary Iron & Vitamin C Absorption Tip:

Consuming Vitamin C rich foods (citrus fruits, amla, tomatoes) alongside non-heme plant iron increases gastrointestinal iron absorption by up to 300%.

HbA1c to eAG Converter & Blood Sugar Interpreter

Converts HbA1c percentage into Estimated Average Glucose (eAG mg/dL) using the ADA formula.

Estimated Average Glucose (eAG)

-- mg/dL

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ADA Formula & Student Note:
eAG (mg/dL) = (28.7 × HbA1c) - 46.7 HbA1c reflects non-enzymatic glycation of hemoglobin over 90-120 days (erythrocyte lifespan).

Pulse Pressure & Mean Arterial Pressure (MAP) Calculator

Calculates Pulse Pressure (Systolic - Diastolic) and MAP according to AHA guidelines.

Mean Arterial Pressure (MAP)

-- mmHg

Pulse Pressure

-- mmHg

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eGFR Kidney Function (CKD-EPI 2021 Race-Free Equation)

Uses the gold-standard CKD-EPI 2021 race-free equation to estimate Glomerular Filtration Rate.

Estimated GFR (mL/min/1.73m²)

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CKD-EPI 2021 Race-Free Standard Note:
Replaces legacy race-based equations. eGFR ≥ 90 is Stage 1; 60-89 Stage 2; 45-59 Stage 3a; 30-44 Stage 3b; 15-29 Stage 4; <15 Stage 5 (Kidney Failure).

AST / ALT (De Ritis Ratio) Liver Enzyme Calculator

Calculates AST/ALT ratio to differentiate alcoholic liver disease from non-alcoholic fatty liver (NAFLD).

AST / ALT De Ritis Ratio

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Body Surface Area (BSA - Mosteller) & Body Metrics

Calculates BSA (m²) using Mosteller formula alongside BMI and Lean Body Mass.

Body Surface Area (Mosteller Formula)

-- m²

Mosteller BSA Formula:
BSA (m²) = √ [ Height (cm) × Weight (kg) / 3600 ]

Cancer Awareness & Preventive Screening Guide

Educational timeline for age-based cancer screenings and CAUTION warning signs.

CAUTION: 7 Warning Signs of Cancer
C: Change in bowel or bladder habits
A: A sore that does not heal
U: Unusual bleeding or discharge
T: Thickening or lump in breast/testicle
I: Indigestion or difficulty swallowing
O: Obvious change in a wart or mole
N: Nagging cough or persistent hoarseness
Screening does not diagnose cancer. Diagnosis requires biopsy and histopathology examination by a pathologist.

MRI vs CT vs X-Ray vs Ultrasound Comparison

Educational guide comparing medical imaging modalities, radiation exposure, and preparation.

ModalityPrimary UseRadiationPreparation
X-RayBones, chest infections, fracturesLow ionizing radiationRemove metal objects
UltrasoundAbdomen, pregnancy, pelvic, soft tissueZero radiation (Sound waves)Full bladder for pelvic scans
CT ScanTrauma, brain, chest, abdomen, cross-sectionsModerate to High ionizing radiationFasting if contrast used
MRI ScanBrain, spinal cord, joints, soft tissueZero radiation (Magnetic fields)Remove all metal, pacemaker screening

Searchable Diagnostic Pathology Directory

Database-driven pathology test catalog with reference ranges and clinical interpretations.

Liver Health / Gastroenterology U/L (or IU/L)
ALT (SGPT) (ALT / SGPT)

Measures Alanine Aminotransferase, an enzyme highly specific to liver parenchymal cells.

Ref Range: Adult Males: 7–56 U/L; Adult Females: 7–35 U/L.
Liver Health / Gastroenterology U/L (or IU/L)
AST (SGOT) (AST / SGOT)

Measures Aspartate Aminotransferase enzyme found in liver, heart, and skeletal muscle cells.

Ref Range: Adult Males: 10–40 U/L; Adult Females: 9–32 U/L.
Kidney Health / Nephrology mg/dL (or mmol/L)
Blood Urea Nitrogen (BUN) (BUN)

Measures nitrogen in blood derived from urea, a breakdown waste product of protein metabolism.

Ref Range: Adults: 7–20 mg/dL; Elderly: 8–23 mg/dL; Pediatrics: 5–18 mg/dL.
Thrombosis & Emergency ng/mL FEU (or µg/mL)
D-Dimer (D-Dimer)

Measures fibrin degradation products released when blood clots undergo plasmin fibrinolysis.

Ref Range: Normal / Negative Rule-out: <500 ng/mL FEU (or <0.5 µg/mL).
Diabetes / Metabolism mg/dL (or mmol/L)
Fasting Blood Sugar (FBS) (FBS)

Measures blood glucose concentration after an overnight fast of at least 8 to 12 hours.

Ref Range: Normal: 70–99 mg/dL; Prediabetes: 100–125 mg/dL; Diabetes: ≥126 mg/dL (confirmed on repeat).
Diabetes / Metabolism % (percentage) & eAG mg/dL
HbA1c (Glycated Hemoglobin) (HbA1c)

Measures percentage of hemoglobin glycated by glucose, reflecting average blood sugar over 2-3 months.

Ref Range: Normal: <5.7%; Prediabetes: 5.7%–6.4%; Diabetes Target: ≥6.5% (Goal for diabetics: <7.0%).
CBC / Hematology % (percentage)
Hematocrit (PCV) (Hct / PCV)

Measures the volumetric percentage of packed red blood cells in total blood volume.

Ref Range: Adult Males: 40.7%–50.3%; Adult Females: 36.1%–44.3%; Children: 34%–40%.
CBC / Hematology g/dL (or g/L)
Hemoglobin (Hb) (Hb)

Measures total oxygen-carrying metalloprotein protein concentration in red blood cells.

Ref Range: Adult Males: 13.8–17.2 g/dL; Adult Females: 12.1–15.1 g/dL; Pregnancy: ≥11.0 g/dL; Children (2-10y): 11.5–14.5 g/dL.
Cardiac & Inflammation mg/L
High-Sensitivity C-Reactive Protein (hs-CRP) (hs-CRP)

Measures minute levels of C-reactive protein to assess low-grade vascular inflammation and cardiovascular risk.

Ref Range: Low Cardiac Risk: <1.0 mg/L; Average Risk: 1.0–3.0 mg/L; High Cardiac Risk: >3.0 mg/L; Acute Infection: >10.0 mg/L.
CBC / Hematology fL (femtoliters)
Mean Corpuscular Volume (MCV) (MCV)

Measures average physical volume (size) of individual red blood cells in femtoliters (fL).

Ref Range: Adults: 80.0–100.0 fL; Pediatrics (varies with age): 75–87 fL.
CBC / Hematology Ratio (numeric)
Mentzer Index (MCV / RBC) (Mentzer Index)

Calculated ratio of MCV divided by total RBC count (MCV / RBC).

Ref Range: Mentzer Index > 13 suggests Iron Deficiency Anemia; Mentzer Index < 13 suggests Thalassemia Trait.
CBC / Hematology cells/µL (or x10^3/µL)
Platelet Count (PLT)

Measures total number of platelets essential for blood clotting and hemostasis.

Ref Range: Adults & Children: 150,000–450,000 cells/µL.
Kidney Health / Nephrology mg/dL (or µmol/L)
Serum Creatinine (Creatinine)

Measures creatinine, a breakdown product of muscle creatine phosphate cleared by renal filtration.

Ref Range: Adult Males: 0.74–1.35 mg/dL; Adult Females: 0.59–1.04 mg/dL; Children: 0.2–0.7 mg/dL.
Iron Studies / Hematology ng/mL (or µg/L)
Serum Ferritin (Ferritin)

Measures intracellular iron storage protein; directly reflects total body iron reserves.

Ref Range: Adult Males: 30–300 ng/mL; Adult Females: 15–200 ng/mL; Low Iron Reserve: <30 ng/mL; Absolute Deficiency: <15 ng/mL.
Thyroid / Endocrinology µIU/mL (or mIU/L)
Thyroid Stimulating Hormone (TSH) (TSH)

Measures pituitary TSH stimulating the thyroid gland to release T4 and T3 hormones.

Ref Range: Non-pregnant Adults: 0.45–4.5 µIU/mL; 1st Trimester Pregnancy: 0.1–2.5 µIU/mL.
Liver Health / Gastroenterology mg/dL (or µmol/L)
Total Bilirubin (Bilirubin)

Measures total breakdown pigment of hemoglobin cleared by hepatic processing.

Ref Range: Adults: 0.2–1.2 mg/dL; Neonates: (varies by post-birth hours).
CBC / Immunopathology cells/µL (or x10^9/L)
Total Leukocyte Count (WBC) (WBC)

Measures total number of circulating white blood cells responsible for immune defense.

Ref Range: Adults: 4,000–11,000 cells/µL; Children: 5,000–14,500 cells/µL.

Universal Medical Unit Converters

Instant units conversion for Glucose, Creatinine, Bilirubin, Hemoglobin, and Temperature.

Glucose (mg/dL ↔ mmol/L)
Hemoglobin (g/dL ↔ g/L)

Medical Student Exam & Viva Learning Hub

Formulas, step-by-step calculations, clinical significance, and memory tips for medical board exams.

Mentzer Index (Hematology Viva)
MCV / RBC Count

<13: Thalassemia Trait \| >13: Iron Deficiency

eAG Diabetes Formula (Endocrinology)
eAG = (28.7 × HbA1c) - 46.7

Converts glycated hemoglobin % to average glucose mg/dL.

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