Disclaimer: Although the advice and information contained in the guidelines and dose calculator is believed to be true and accurate at the time of going to press, neither the authors nor the publishers can accept any legal responsibility for any errors or omissions that may have been made. Alberta Precision Laboratories Transfusion Medicine gratefully acknowledges ORBCoN Transfusion Ontario for use of their template for the Ideal Body Weight Calculator with IVIG Dosing. The Dose Calculator is intended to be used when determining the dose of IVIG for clinically obese patients; it is not recommended for pediatric patients nor any patients (incl. adults) under 5ft in height. Consult Transfusion Medicine physician for dosing weight in pregnancy. For other patients, the dosing information recommended in the AHS IVIG Product Monographs (Blood Components & Products Information/Monographs) should be followed. It is acceptable to give the smallest IVIG dose that provides clinical efficacy. Neither the monographs nor the dose calculator is intended to replace sound clinical judgment concerning a patient's unique situation.

Please note, to use this calculator:

Height must be between 153-241 cm (60-95 inches).

Weight must be between 20-400 kg (44-882 pounds).

Definitions:

Ideal Body Weight1 (IBW), Devine Formula is:

Ideal Body Weight (male) = 50.0 kg + 2.3 kg (each 2.5 cm > 150 cm)        Ideal Body Weight (female) = 45.5 kg + 2.3 kg (each 2.5 cm > 150 cm)

Dosing Weight is an adjusted body weight (of obese or overweight patients) and should only be used to calculate the dose of drugs for which there are recommendations specifying that the actual body weight should be adjusted for use in the dose calculations.         Dosing Weight = IBW + [0.4 x (Actual - IBW)]         exception:  if Actual < IBW,  then Dosing Weight = Actual         (Actual = actual body weight)

References: 1. Pai MP, Paloucek FP. The origin of the "ideal" body weight equations. Ann Pharmacother. 2000 2. Sep;34(9):1066-9. Siegel J. Immunoglobulins and obesity. Pharmacy Practice News. 2010;37(1):8-9.

Updated 15 July 2021