eGFR Calculator (CKD-EPI 2021) + Renal Dosing by Dr Lakdhesz

eGFR Calculator (CKD-EPI 2021) + Renal Dosing

Adults only (18 years and above). Race-free CKD-EPI 2021. Verify doses with your local guideline.CLICK TITLE ABOVE FOR PROPER VIEW

Patient inputs

Age (years)

Sex MaleFemale

Serum creatinine

Units umol/Lmg/dL

eGFR: -- mL/min/1.73m2 CKD: --

Equation: 142 x min(Scr/k,1)^a x max(Scr/k,1)^-1.200 x 0.9938^age x [1.012 if female]. k = 0.7 (female) or 0.9 (male). a = -0.241 (female) or -0.302 (male).

CKD staging (quick guide)

Stage	eGFR (mL/min/1.73m2)
G1	90 or more
G2	60 to 89
G3a	45 to 59
G3b	30 to 44
G4	15 to 29
G5	Less than 15

Show only the recommended column or field for this eGFR

Renal dosing viewer (examples)

All classes Antibiotic Analgesic Other

CKD: -- Recommended column or field is highlighted below.

Drug	Usual dose	G3a 45 to 59	G3b 30 to 44	G4 to G5 below 30	Notes	Class

Reference style: banded by eGFR. Always confirm with brand label and local formulary. Examples below are for teaching only.

Disclaimer: Educational reference only. Not a medical device. Use with clinical judgment. For patient specific decisions, consult your senior or specialist and follow hospital policy.

References: CKD-EPI 2021 race-free equation; KDIGO CKD staging bands; local formulary banding for drug dose adjustment.

Clinical Toolbox – Free Medical Calculators & Guidelines (ABG, ECG, Dosing, Vaccines) by Dr.Lakdhesz

Clinician Toolbox

© 2025 by Dr Lakdhesz. Educational support only — confirm with local guidelines.

Renal & Hepatic Dose Adjuster

Cockcroft-Gault (Creatinine Clearance)

Age (years)

Sex MaleFemale

Weight (kg)

Height (cm) (for IBW, optional)

Serum Creatinine

umol/Lmg/dL

Weight to use Actual weight IBW (ideal) AdjBW (if >120% IBW)

Note: Use formulary bands for dosing. Consider measured CrCl/eGFR in extremes or rapidly changing renal function.

Child-Pugh (hepatic reserve)

Encephalopathy None (0)Grade I-IIGrade III-IV

Ascites NoneMild/controlledSevere/refractory

Bilirubin

umol/Lmg/dL

Albumin

g/Lg/dL

INR

Fluids & Electrolytes

Maintenance Fluids

Age group AdultPaediatric

Weight (kg)

Deficits (rough guides)

SexMaleFemale

Age (years)

Weight (kg)

Na current (mmol/L)

Na target (mmol/L)

K current (mmol/L)

K target (mmol/L)

HCO3 current (mmol/L)

HCO3 target (mmol/L)

Safety: aim max 10 mmol/L sodium change in 24 h (8 if high risk). Replace potassium slowly with ECG/renal monitoring. Use local protocols.

Clinical Decision Hub

CURB-65 (pneumonia severity)

ConfusionNoYes

Urea > 7 mmol/LNo/unknownYes

RR >= 30/minNoYes

BP (SBP < 90 or DBP <= 60)NoYes

Age >= 65NoYes

Wells (pulmonary embolism)

Clinical DVT signsNoYes (3)

PE more likely than alternativeNoYes (3)

Heart rate > 100NoYes (1.5)

Immobilisation/surgery < 4 wNoYes (1.5)

Prior DVT/PENoYes (1.5)

HemoptysisNoYes (1)

MalignancyNoYes (1)

CHA2DS2-VASc (AF stroke risk)

Age

SexMaleFemale

CHF/LV dysfunctionNoYes

HypertensionNoYes

DiabetesNoYes

Stroke/TIA/TENoYes (2)

Vascular diseaseNoYes

Malaysia (KKM) — Child Vaccine Scheduler

Date of birth

State-specific doses Peninsular / Sarawak (no Sabah 6 m measles) Sabah (add measles at 6 months) Sarawak (add JE at 12 and 21 months)

Child sex (for HPV 13 y)FemaleMale

Cross-check with latest MOH/KKM circulars for catch-up and brand specifics.

Procedures Checklists

Choose a procedure Indwelling Urinary Catheter (IDC) Nasogastric Tube (NGT) Arterial Blood Gas (ABG) Lumbar Puncture (LP) Pleural Tap (Thoracentesis)

Concise safety checklists. Adapt wording to your hospital policy.

Disclaimer: Educational reference only. Verify doses and decisions with senior review and local formulary.

ABG & VBG Calculator – Blood Gas Analysis Tool by Dr Lakdhesz

ABG/VBG Interpreter + ECG Helper

© 2025 by Dr Lakdhesz.

ABG / VBG Interpreter

Sample type ABG (arterial)VBG (venous)

pH

PCO2 (mmHg)

HCO3 (mEq/L)

Estimate arterial from VBG

apply small correction if VBG

VBG to ABG rough guide: pH_a = pH_v + 0.03; PaCO2 = PvCO2 - 5 mmHg. Use with caution.

Electrolytes / Extras (optional)

Na (mEq/L)

Cl (mEq/L)

Albumin (g/dL)

PaO2 (mmHg)

FiO2 (fraction)

Age (years)

Safety: This is an educational aid, not a diagnostic device. Check the whole clinical picture and local protocols.

ECG Quick Interpretation

Heart rate (bpm)

RR interval (ms) optional

PR (ms)

QRS (ms)

QT (ms)

P waves PresentAbsentFlutter / sawtooth

Rhythm flag

irregularly irregular

Lead I QRS PositiveNegativeIsoelectric

aVF QRS PositiveNegativeIsoelectric

Ischaemia / injury

ST elevation ST depression T inversion Pathologic Q

Disclaimer: Educational reference only,not a substitute for clinical judgment.

DIRECTION

1. PAEDS DOSE CALCULATOR 

2.NNJ CALCULATOR

3.ABG/VBG/ECG CALCULATOR 

4..Neonate Feeding Calculator 

REF:

🔹 ABG / VBG Interpreter

• Winter SD, et al. The fall of the serum bicarbonate level in metabolic acidosis: a reappraisal of the Winter’s formula. N Engl J Med. 1967.

• Narins RG, Emmett M. Simple and mixed acid–base disorders: a practical approach. Medicine (Baltimore). 1980;59:161-187.

• Story DA, Poustie S. Essential principles in interpreting arterial blood gases. Anaesthesia & Intensive Care Medicine. 2010.

• Kelly AM. Review article: Can venous blood gases replace arterial blood gases in emergency medical care. Emerg Med Australas. 2010.

🔹 ECG Helper

• Surawicz B, Knilans TK. Chou’s Electrocardiography in Clinical Practice. 6th ed. Elsevier, 2008.

• Goldberger AL. Clinical Electrocardiography: A Simplified Approach. 9th ed. Elsevier, 2017.

• Life in the Fast Lane (LITFL). ECG Library. https://litfl.com/ecg-library.

• American Heart Association. Advanced Cardiovascular Life Support Provider Manual. 2020 update.

5.Clinical Toolbox – Free Medical Calculators & Guidelines (ABG, ECG, Dosing, Vaccines)

🔹 Renal & Hepatic Dose Adjuster

• Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine. Nephron. 1976;16(1):31-41.

• KDIGO 2012 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int Suppl. 2013;3(1).

• Pugh RN et al. Transection of the oesophagus for bleeding oesophageal varices. Br J Surg. 1973;60(8):646-9. (Original Child-Pugh classification).

• EASL Clinical Practice Guidelines: Management of patients with decompensated cirrhosis. J Hepatol. 2018.

⸻

🔹 Fluids & Electrolytes

• Holliday MA, Segar WE. The maintenance need for water in parenteral fluid therapy. Pediatrics. 1957;19(5):823-32. (Holliday-Segar method).

• Moritz ML, Ayus JC. Maintenance intravenous fluids in acutely ill patients. N Engl J Med. 2015;373:1350-1360.

• Adrogue HJ, Madias NE. Hyponatremia. N Engl J Med. 2000;342:1581-1589.

• Sterns RH, et al. Treatment of severe hyponatremia: rapid correction and risk of osmotic demyelination. N Engl J Med. 1986..

⸻

🔹 Clinical Decision Hub (Scoring Systems)

• CURB-65: Lim WS, van der Eerden MM, et al. Defining community acquired pneumonia severity on presentation to hospital. Thorax. 2003;58:377-382.

• Wells Score for DVT/PE: Wells PS, et al. Value of assessment of pretest probability of deep-vein thrombosis in clinical management. Lancet. 1997;350:1795-1798.

• CHA₂DS₂-VASc: Lip GYH, Nieuwlaat R, Pisters R, Lane DA, Crijns HJGM. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation. Chest. 2010;137(2):263-272.

⸻

🔹 Vaccine Scheduler (KKM Malaysia)

• Primary Reference: Ministry of Health (MOH) Malaysia / Kementerian Kesihatan Malaysia (KKM).

• “National Immunisation Schedule” (Latest circular – 2021, with Sabah and Sarawak modifications).

• Available from: KKM official website and KKM Portal.

• WHO. Immunization in Practice: A practical guide for health staff. 2015 update.

⸻

🔹 Procedures Checklists

• Dougherty L, Lister S. The Royal Marsden Hospital Manual of Clinical Nursing Procedures. 9th Edition. Wiley-Blackwell, 2015.

• Thomas J, et al. Oxford Handbook of Clinical Skills. Oxford University Press, 2014.

• NICE Clinical Skills guidance documents.

• Local hospital policies (always to be cross-checked).

⸻

6.eGFR Calculator 

7.Teleconnect -Follow Up Message with Patients

8.Stock Count for GP

Disclaimer:

The tools, calculators, and content provided in this application are intended for use by healthcare professionals for educational and clinical reference purposes only.

They are based on published medical guidelines and references, which are publicly available and not proprietary.

This application does not provide medical advice and is not a substitute for clinical judgment, institutional protocols, or consultation with a qualified healthcare provider.

By using this application, you agree that the developer, contributors, and affiliates are not responsible or liable for any errors, omissions, or outcomes resulting from its use.

Always verify results with official guidelines before applying them in patient care.

© 2025 Lakdhesz Pediatrics Tools — Empowering clinicians with smarter calculators.  

For reference use only. Always confirm with official guidelines.

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Neonatal Jaundice Calculator

Neonatal Jaundice — Mint Tools

NNJ Calculator by Dr.Lakdhesz

Hours of Life

Compute age in hours since birth.

Time of Birth

Current Time

Tip: If time of birth is unknown, estimate carefully and confirm clinically.

Hours of Life

—

Use table row (nearest)

—

Jaundice Risk

Risk band by GA band + maternal blood group + G6PD.

Mother’s Blood Group A+B+AB+O+ A-B-AB-O-

Gestational Age <35 weeks 35–37w6d ≥38 weeks

G6PD Status Normal Deficient

Risk Group

—

Thresholds at — h

Choose GA & factors, then we’ll show phototherapy / exchange thresholds.

Quick hours

Reference — ≥35 weeks

Phototherapy and Exchange thresholds (mg/dL). Replace numbers with guideline if needed.

Hours	LOW (Photo)	LOW (Exchange)	MED (Photo)	MED (Exchange)	HIGH (Photo)	HIGH (Exchange)

Reference — ≤34 weeks

NICE Guidelines

Hours	23 wks Photo	23 wks Exch	24 wks Photo	24 wks Exch	25 wks Photo	25 wks Exch

Hours	26 wks Photo	26 wks Exch	27 wks Photo	27 wks Exch	28 wks Photo	28 wks Exch

Hours	29 wks Photo	29 wks Exch	30 wks Photo	30 wks Exch	31 wks Photo	31 wks Exch

Hours	32 wks Photo	32 wks Exch	33 wks Photo	33 wks Exch	34 wks Photo	34 wks Exch

Educational reference only. Confirm with current local/AAP/NICE protocols & senior review.USE AS A REFERENCE ONLY.

Pediatric Dose Calculator by Weight (Frank Shann 17th Edition 2017) – Quick Guide for GPs & Clinics by Dr Lakdhesz

Body weight (kg)

Age (months)

Albendazole strength 200 mg/5 mL 400 mg/5 mL

Quick weights

Drug list

Drug & rule	Per dose	mL/dose	Frequency	Notes

Albendazole — Dose by Weight

Indication	Per dose	mL/dose*	Regimen

*mL/dose uses Albendazole suspension strength selected above.

OD=once daily, BD=twice daily, TDS=three times daily, QID=four times daily, Q6H PRN=every 6 h as needed. Verify bottle strength & local guidance. Adjust in renal/hepatic impairment and in pregnancy.Confirm allergies & interactions. Source (Frank Shann 17th Edition 2017) /MIMS