Methods for delivery of bodily fluids onto a fibrous substrate

A system for collecting blood from a subject, the system comprising:

• a blood collection device sized and shaped to be positioned against skin of the subject, wherein the blood collection device is actuatable to puncture the skin of the subject and to collect blood from the subject;
• a collection cartridge having a first end portion and a second end portion opposite the first portion, wherein the collection cartridge defines a lumen extending in a direction at least partially between the first and second end portions, and wherein the first end portion includes a connector sized and shaped to be releasably coupled to the blood collection device to create a hermetic seal with the blood collection device and to receive a flow of the blood from the blood collection device in the direction at least partially between the first and second end portions;
• and
• multiple porous substrates defining a modular network within the lumen between the first and second end portions, and wherein the substrates are spaced apart from one another in the direction at least partially between the first and second end portions and out of contact with one another along the lumen such that the substrates sequentially receive the flow of blood and store at least a portion of the blood.