Zambian HIV Guidelines:: Calculations: Ideal Body Weight, Body Mass Index and Creatinine Clearance

	Zambia HIV National Guidelines
	Introduction HIV Counseling and Testing Sexually Transmitted Infections (STIs) General Principles of Antiretroviral Therapy for Chronic HIV Infection in Adults and Adolescents When to Start ARV Therapy for Chronic HIV Infection in Adults and Adolescents Initial Regimen for ARV Therapy Adherence Baseline evaluation and Monitoring Calculations: Ideal Body Weight, Body Mass Index and Creatinine Clearance ARV Therapy for Individuals with Tuberculosis Co-Infection Adverse Effects and Toxicity Immune Reconstitution Inflammatory Syndrome (IRIS) Changing or Stopping ART Treatment Failure Stopping ARV Therapy Post Exposure Prophylaxis Cotrimoxazole Prophylaxis WHO Staging in Adults and Adolescents Nutrition Care and Support Palliative Care in HIV and AIDS
	Guide Editors
	Editor In Chief Joel E. Gallant, MD, MPH Pharmacology Editor Paul Pham, PharmD, BCPS Zambia Guideline Team Peter Mwaba MMed PhD FRCP Alywn Mwinga MMed Isaac Zulu MMed MPH Velepie Mtonga MMed Albert Mwango MBChB Jabbin Mulwanda MMed FCS

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Calculations: Ideal Body Weight, Body Mass Index and Creatinine Clearance

04-30-2008

Ideal Body Weight (IBW)

IBW = expected weight for a patient of a given height. Used to determine:
-Calculated creatinine clearance (using Cockcroft-Gault formula)
-Drug dosing
-Monitoring weight for stable patients both on or not on ARVs
IBW calculations below based on Devine Formula for men and Robinson formula for women.

Ideal Body Weight Table

                        IBW (kg) for:

Height (m)                Male                Female

1.52                            50                        45.5

1.55                            52.3                     47.8

1.57                            54.6                     50.1

1.60                            56.9                     52.4

1.63                            59.2                     54.7

1.65                            61.5                     57

1.68                            63.8                     59.3

1.70                            66.1                     61.6

1.73                            68.4                     63.9

1.75                            70.7                     66.2

1.78                            73                        68.5

1.80                            75.3                     70.8

1.83                            77.6                     73.1

1.854                         79.9                     75.4

1.88                            82.2                    77.7

1.90                            84.5                     80

1.93                            86.8                     82.3

1.95                            89.1                     84.6

1.98                            91.4                     86.9

2.00                            93.7                     89.2

Body Mass Index (BMI)

Use BMI to help determine need for nutritional supplementation or therapeutic feeding. Requires both height and weight. Calculate based on actual body weight of the patient using following formula:
BMI = weight (kg) / height (m)²

Calculated Creatinine Clearance (CrCl): Cockcroft-Gault equation

Men: CrCl = (140-age) x IBW (kg) / (0.815 x serum creatinine [umol/L])
Women: CrCl = (140-age) x IBW (kg) x 0.85/ (0.815 x serum creatinine [umol/L])
If unable to perform creatinine, specimen should be sent to nearest facility where test can be performed.

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