Machine Setup According to Prescription

Turning the Prescription Into a Safe Setup

The dialysis prescription is the physician's order that controls what the machine should deliver. The technician's job is to configure the machine to match that order within facility policy - not to invent settings or independently change the prescription. If any order is missing, unclear, expired, or inconsistent with the patient or available supplies, the correct action is to stop and ask the appropriate licensed staff before initiating.

The prescription is built to deliver adequate dialysis (commonly tracked by spKt/V >= 1.2 per treatment or URR >= 65%) while safely removing the patient's fluid gain. Setting the machine wrong - wrong bath, wrong dialyzer, wrong time, or wrong UF goal - can under-dialyze the patient or cause hypotension, cramps, and electrolyte harm. This is why setup is treated as a deliberate, checklist-driven process rather than a routine habit.

Core Prescription Elements to Verify

Layouts differ between paper forms and electronic systems, but the same core elements must be confirmed every treatment.

Patient identification is part of setup

Patient ID is not a formality. The right prescription must be matched to the right patient using required identifiers (typically two, such as name and a second identifier). A chair number, routine schedule, or memory is never enough to connect a patient to a machine that can remove liters of fluid and alter electrolytes. A wrong-patient connection can deliver the wrong bath or UF goal to someone for whom it is unsafe.

Ultrafiltration Goal: Calculating What to Remove

The ultrafiltration (UF) goal is the volume of fluid the machine should remove during the treatment. The basic calculation is:

UF goal = pre-treatment weight - target (dry) weight + facility-defined additions (e.g., saline/normal-saline given during treatment, rinseback, food/drink as policy allows).

Worked example: A patient's pre-treatment weight is 82.4 kg and the target weight is 80.0 kg. The straightforward fluid gain is 82.4 - 80.0 = 2.4 kg ≈ 2.4 L to remove. If the plan includes returning 0.3 L of saline during the run (rinseback/bolus), facility policy may add that to the goal, giving roughly 2.7 L. Because 1 kg of body water ≈ 1 L, the weight difference drives the UF goal.

The technician then double-checks the entered UF goal against the prescription and the weights. A large or unusual UF goal, a pre-weight that does not match the patient's recent values, or a goal that conflicts with the target weight should be reported before treatment begins. Removing too much fluid causes intradialytic hypotension and cramps; removing too little leaves the patient fluid-overloaded. A transcription slip (entering 4.0 L instead of 2.0 L) is a classic, dangerous setup error that a verification step catches.

The machine enforces the goal through its ultrafiltration (UF) control system, which removes fluid at a calculated UF rate (UFR) = UF goal divided by treatment time. A 3.0 L goal over a 4-hour treatment is a UFR of 750 mL/hr. Very high UF rates (often cited as a concern above roughly 13 mL/kg/hr) are linked to hypotension and cramping, so shortening the treatment time without changing the goal raises the rate and the risk. If a patient cannot tolerate the required rate, that is a finding to report - not something the technician resolves by quietly lowering the goal.

Pre-Initiation Checks and Documentation

Before the patient is connected, the machine must pass its required tests and the disposables must be verified.

• Machine self-tests and alarm tests complete and passed.
• Conductivity, pH, and temperature within facility-accepted ranges.
• Dialyzer and bloodline set - correct type, intact packaging, not expired, properly primed and air-free, secure connections.
• Sterility indicators checked if used; nothing damaged, expired, contaminated, or questionable is used.

If the machine fails testing, gives unresolved alarms, or cannot complete required checks, the correct action is to remove it from service per policy and notify the right staff - not to override or work around the failure.

Documentation must be honest and timely. Record meaningful setup events: wrong bath discovered before start, dialyzer changed, machine failed test and removed from service, setup repeated, RN notified. Critically, do not document that treatment was ready until the required checks are truly complete. A setup error - even one caught before connection - is a near miss worth reporting because it reveals a process risk. Charting a normal check before it is performed is falsification and a patient-safety hazard.