Document VJqqx4OXqoDXo4gLMzYEGwypZ

In answer to your request for preservative information for urine collection, please amend paragraph 4 of instructions dated July 29, 1976, to read: Urine with a specific gravity of less than 1.010 is not satisfactory for examination and will have to be recollected. A minimum of 100 mis is to be collected for lead determination. Add 1/2 ml (0.5 ml) concentrated hydrochloric acid per 100 mis of urine as a preservative. J'b cc: P. M. Zakriski R S 0 Files 0. S >1 sG'v