Seems pretty easy to spot, right?
But what if Waldo is in a large, busy crowd - is he still easy to spot?
Sometimes, an early pregnancy is harder to spot than Waldo. Because pregnancy tests are so sensitive, women are getting that first ultrasound quite early on in gestation. There is a window of about 2 - 3 weeks after conception when an early intrauterine pregnancy might not be visualized. This creates a quandary - is she really pregnant, is there a problem with the pregnancy or a problem with the dates, and, worst case scenario, is the pregnancy ectopic. Doctors refer to this clinical situation as "Pregnancy of Uncertain Location" or PUL. The usual management consists of serial measurements of the blood pregnancy hormone or Beta HCG and repeating the ultrasound until the situation is resolved. The protocol had been that failure to see a normally-situated pregnancy on ultrasound at a critical level of Beta HCG was highly suspicious for an ectopic pregnancy or a failed intrauterine pregnancy. Unfortunately, as we all are aware, life is not always so neat.
Doubilet et al, writing in the New England Journal of Medicine reviewed the diagnostic criteria of pregnancy of uncertain location and failed pregnancy and found that previously utilized criteria were a set up for diagnostic error, resulting in administration of a powerful teratogenic drug, Methotrexate, in cases subsequently found to be normal pregnancy. Nurmohamed et al found 8 cases of intrauterine pregnancy in which methotrexate was administered for suspected ectopic. None of these cases had a happy outcome.
Doubilet's review offered new consensus guidelines for the diagnosis of both early pregnancy failure and pregnancy of uncertain location, nicely summarized Here.
So if you find yourself in this situation, please review this post again and perhaps ask your doctor to review it as well.
For more information or to schedule an ultrasound, please call (718) 925-6277.
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