Parts for diagnostic devices

A disposable diagnostic part comprising:

• a housing to detachably attach to a reusable part of a diagnostic device, the reusable part including an agent;
• a sample collector to collect a target sample;
• and
• a chip comprising microfluidic channels to transport the agent and the target sample to a fluid combination chamber.

A method of performing a point-of-care diagnosis, the method comprising:

• engaging a diagnostic device with a target sample, the diagnostic device comprising a reusable part including an agent, and a disposable part detachably attached to the reusable part and comprising a sample collector to collect a biological sample;
• flowing the agent and the biological sample through fluid channels of the reusable part to a target chamber to combine the agent and the biological sample to form a fluid combination;
• testing, by the diagnostic device, the fluid combination to diagnose a health condition;
• and
• detaching the disposable part from the reusable part to discard the disposable part.