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Isn't a specimen without creatinine a substituted specimen?

From: Dr K.
Date: 21 Oct 2005
Time: 08:06:48 -0700
Remote Name: 12.40.33.118

Comments

If a result comes back from the lab as no creatinine detected, but with a normal specific gravity. it has to be treated as an invalid specimen, correct?  The lab reported it as such.  However we know that one cannot produce urine with no creatinine, so why is this not treated as a substituted specimen?