What the collector does after an insufficient urine sample
The urine procedure in 49 CFR 40.193 applies when the sample is too small to complete the test. A urine collection normally needs 45 mL from one void. If the collection continues using urine, the collector provides another opportunity and records the timing.
The procedure allows up to three hours from the first unsuccessful attempt. The collector urges fluid intake, up to 40 ounces distributed reasonably during that period; declining to drink is not itself a refusal. Follow the collector’s instructions rather than forcing fluids or leaving to return later. This is an explanation of the testing rule, not personal medical advice.
When a medical evaluation is required
If the urine collection ends without an adequate specimen, the collector informs the DER. After consulting the MRO, the DER directs the employee to obtain an evaluation within five days from a licensed physician acceptable to the MRO who has expertise relevant to the failure to provide a sufficient specimen. An appointment you arrange independently is not necessarily the required evaluation.
The referral physician makes a recommendation about whether a medical condition could have prevented an adequate specimen, and the MRO makes the determination under the rule. DOT recognizes certain physiological conditions and medically documented pre-existing psychological disorders. Unsupported situational anxiety or dehydration is not enough on its own. Give relevant information to the medical professionals reviewing the case.
A testing difficulty and a refusal are different findings
An accepted medical explanation can lead to a canceled test. If the medical review does not establish an adequate medical basis, the MRO can determine the event to be a refusal under the procedure. Leaving before the process finishes or refusing a required further attempt can create a separate refusal issue. The details matter more than the label “shy bladder.”
This article concerns urine collection. DOT rules also address insufficient oral fluid using a different procedure, and Part 40 permits alternate-specimen collection in specified circumstances under the employer’s instructions. That does not mean a driver can demand a switch of specimen type at a particular collection site, and it does not mean any particular clinic offers oral-fluid collection.
Illustrative example: a driver stays but cannot provide enough
A driver stays for the urine collection period and still cannot provide a sufficient specimen. That fact alone does not mean a SAP appointment is the immediate next step. The DER and MRO must address the required medical evaluation. If a refusal is ultimately recorded, the driver can then discuss the applicable SAP requirements after a refusal.
This example is not a client outcome. Keep the collection paperwork, timing and referral instructions, and contact the DER promptly about the evaluation deadline. A SAP becomes relevant if the process results in a DOT violation requiring the return-to-duty process.
Get support if a SAP is required
If your testing process results in a confirmed DOT violation, speak with an independent SAP provider about evaluation appointments, fees and the return-to-duty process.