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Depleted haptoglobin levels, reacton to antibiotics?

Female 31.

A LOT of testing done, but no answer.

Bilirubin, LDH, Direct Coombs Test, Indirect Coombs Test, Anti RBC Antibodies, Anti RBC antibodies titrenvd, CBC, Bilirubin in Urine, ESR, Creatinine, Urobilinogen, Hemaglobin, Hematocrit all seem to be fine, but Haptoglobin is <0.01 - completely depleted in three tests done in a week. No history or symptoms of anemia or haemolysis.

9 days ago Nitrofurantoin (200g a day for 5 days) was taken and daily birth control (Qlaira). Both are known to decrease levels of haptoglobin but nothing about complete depletion.

Could this be an extended effect from Nitrofurantoin? When should the test be repeated ?
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