Pre-Treatment Assessment and Vital Signs
Key Takeaways
- Pre-treatment assessment is the first clinical safety gate: confirm patient identity, review the treatment record, weigh the patient, and take a full set of vital signs before any setup is treated as routine.
- Vital signs are trend data; a value inside a textbook range can still be abnormal for one patient, so always compare against that patient's usual pre-treatment pattern and the last treatment record.
- Orthostatic (standing vs sitting) blood pressure and pulse changes, a new fever, a new irregular pulse, or new respiratory distress are escalation findings, not numbers to chart and ignore.
- Worked UF logic begins here: pre-weight minus estimated dry (target) weight, plus anticipated intake and rinseback, drives the ultrafiltration goal the technician verifies against the prescription.
- The CCHT collects, documents, and reports; the RN or qualified staff interprets findings and directs clinical decisions outside the technician scope of practice.
Assessment Is a Safety Gate, Not a Formality
On the CCHT exam, pre-treatment assessment is the point where baseline data are measured and compared against the prescription, the recent treatment record, and the patient's current condition. Clinical content is the largest exam domain (48-52%), and this gate is where most of those questions live.
The workflow is fixed. First, identify the patient per facility policy using two identifiers (name and a second identifier such as date of birth) — never by station number or assumption. Then review the treatment record, obtain the pre-treatment weight, and take a full set of vital signs: blood pressure, pulse, temperature, respirations, and the patient's general appearance and mental status.
These are objective data (signs) you measure with an instrument, distinct from subjective data (symptoms) the patient reports, such as cramps, nausea, or dizziness. Both matter, and both are documented before setup decisions become routine.
Normal Ranges and What to Compare Against
Learn the adult ranges, but learn just as firmly that dialysis patients are not average adults. Many run chronically hypertensive, take antihypertensives that blunt heart rate, and carry fluid that shifts pressure between treatments. The single most testable concept is compare to the patient's own baseline, not only to a textbook range.
| Vital sign | Typical adult range | Common dialysis red flag |
|---|---|---|
| Blood pressure | < 120/80 mmHg (goal varies) | Sharp drop from usual pre-weight BP, or severe hypertension per facility parameter |
| Pulse | 60-100 beats/min | New bradycardia, tachycardia, or a newly irregular rhythm |
| Respirations | 12-20 breaths/min | Labored breathing, inability to lie flat (orthopnea) |
| Temperature | 97.6-99.6 F (oral) | 100.4 F or higher (possible access or systemic infection) |
| Oxygen saturation | 95-100% | Below 90%, especially with shortness of breath |
Key terms the exam uses: hypotension (low BP, fall and intolerance risk), hypertension (high BP, often fluid-related), bradycardia (pulse < 60), tachycardia (pulse > 100), afebrile/febrile (without/with fever), and orthostatic hypotension (a positional BP drop).
Orthostatics, Temperature Sites, and Why They Matter
Orthostatic (postural) vital signs compare sitting (or lying) values with standing values. A drop of roughly 20 mmHg systolic or 10 mmHg diastolic, or a rise in pulse of about 20 beats/min on standing, suggests volume depletion — a patient who may already be at or below dry weight. Starting aggressive fluid removal on such a patient invites intradialytic hypotension and cramping.
Document the temperature site, because site changes the value. Rectal and tympanic read about 1 F higher than oral; axillary and temporal read about 1 F lower. An axillary 99.5 F is effectively near the 100.4 F fever line once corrected.
A new fever in a catheter or graft patient is a high-priority finding: it may signal access-related bloodstream infection, which is reported before treatment so the RN can evaluate, draw cultures if ordered, and decide whether to proceed.
Tying Assessment to the Ultrafiltration Goal
Pre-treatment assessment is also where the ultrafiltration (UF) goal takes shape. The core relationship the exam expects you to apply is:
- UF goal = (pre-treatment weight - estimated dry/target weight) + anticipated intake during treatment + saline rinseback volume.
The difference between pre-weight and estimated dry weight (EDW) — the lowest weight a patient tolerates without symptoms of overload or depletion — is the fluid to remove. Anticipated oral/IV intake and the saline rinseback (often ~150-250 mL, per facility) are added because that volume also leaves the body at end of treatment.
Worked example: Pre-weight 72.0 kg, target weight 70.0 kg, expected intake 0.3 kg, rinseback 0.2 kg. UF goal = (72.0 - 70.0) + 0.3 + 0.2 = 2.5 kg (2.5 L). The technician verifies this against the prescription's UF limit and treatment time; an unusually large gain that pushes the UF rate above safe limits is reported, not silently programmed.
The technician does not redefine dry weight or rewrite the prescription. The role is to measure accurately, compute the ordered goal, and flag when the numbers do not fit safe routine treatment.
The Pre-Treatment Patient Interview
Before connection, ask a focused interdialytic interview. Targeted questions catch problems that vital signs alone miss:
- Missed or shortened treatments, hospital visits, or ER trips since last session
- New medications, missed blood pressure pills, or new antibiotics
- Falls, bleeding (including prolonged bleeding from needle sites), or bruising
- Fever, chills, nausea, vomiting, or diarrhea (which cause fluid loss)
- Chest pain, shortness of breath, or trouble lying flat
- Cramps, dizziness, or fainting at the end of the last treatment
- Access changes: new pain, swelling, numbness, or a cold hand
Chart findings factually: measured values, exact patient statements, repeat readings, who was notified, and the action taken. Do not chart conclusions about why a symptom exists — that interpretation belongs to qualified staff. A common exam trap is to start treatment and "tell the nurse later"; the safer answer is recheck per policy, compare with the record, keep the patient safe, and report before initiation.
Reviewing the Treatment Order in the Assessment Step
The assessment step is also where the technician first reviews the treatment order that will govern the session. Even before machine setup, confirming the order alongside the assessment prevents a common error: assessing one plan and then treating another. The technician reads the current prescription for treatment time, target weight, UF goal, dialysate composition, and anticoagulation, and checks that the assessment findings fit that plan.
When assessment and order disagree, that disagreement is itself a finding. Examples include a patient who is already below the ordered target weight, a UF goal that the current weight does not support, or a dialysate that no longer matches recent labs. None of these are quietly resolved by the technician.
The correct response is the same throughout this chapter: gather accurate data, compare it to the order and the record, and report the conflict to the RN before initiation. The assessment step exists precisely to catch these mismatches while they are still easy to fix — before the patient is connected and fluid removal has begun.
A patient's sitting blood pressure is 118/72 with a pulse of 78. On standing, the BP is 92/58 and the pulse is 102. The patient mentions feeling lightheaded and had diarrhea overnight. What is the most appropriate technician action before initiating treatment?
Pre-treatment weight is 81.4 kg, the prescribed target (dry) weight is 79.0 kg, anticipated intake during treatment is 0.4 kg, and the facility uses a 0.2 kg saline rinseback. What ultrafiltration goal should the technician verify against the prescription?
A catheter-dependent patient is afebrile by history but the pre-treatment oral temperature reads 100.6 F, and the patient reports chills. What should the technician do?
Which statement best reflects the CCHT's role during pre-treatment assessment?