Apparatuses and methods for inline collection of a fluid specimen

A collection fitting for sampling fluid from a tissue site, the collection fitting comprising:

• a switch fitting having a first end, a second end, a cavity formed into the first end of the switch fitting, a first passage extending through the switch fitting from the cavity to the second end, and a second passage extending through the switch fitting from the cavity to the second end;
• and
• a bypass switch coupled to the second end of the switch fitting and operable in a bypass position to fluidly couple the first passage and the second passage through the bypass switch, and in response to movement of the bypass switch, operable in a sampling position to fluidly couple the first passage and the second passage through a specimen containers;
• a cap coupled to the first end of the switch fitting, wherein a portion of the cap is disposed within the cavity, the cap having a first bore and a second bore, the first bore and the second bore extending through the cap, and the first passage fluidly coupled to the first bore of the cap and the second passage fluidly coupled to the second bore of the cap;
• and
• a gap formed between an end of the cap and an inner wall of the cavity, the gap comprising a sensing bypass configured to fluidly communicate pressure between the first bore and the second bore in the bypass position and in the sampling position.