**2.1.4 Precautions**

In pediatric cases the physiology and metabolism is different from adults' and the uptake of radiopharmaceuticals vary greatly, for example the bone uptake in children is up to 80% compared with that of adults at up to 40%. The pediatric dose of radiopharmaceuticals is calculated based on the standard weight method (the pediatric dose=(patient weight in kg×standard adult dose)÷70kg) or body surface area methods. With 99mTc labelled radiopharmaceuticals, we suggest a 24 to 36 hr breast feeding delay, and 67Ga based products for a 72 hr delay.

In pregnant women, the nuclear medicine examinations are forbidden.
