Medutest
Fast turnaround and the widest compound acceptance, at unit mass resolution rather than high resolution. 934 reports in the index — 14.2 % of the total.
Identification and method basis
- Laboratory
- Medutest
- Short code in this index
- Medutest
- Location
- Ljubljana, Slovenia
- Founded
- 2020
- Reports contributed
- 934
- Share of index
- 14.2%
- Purity gradient
- 25min
- Mass resolution
- Unit resolution (single quadrupole)
- Stated turnaround
- 2–5 business days
- Measured offset vs reference
- +0.070 pp
- Within-lab repeatability
- 0.26pp
Medutest is the fastest of the six laboratories and accepts the widest range of submissions, including several compound classes the others decline. Both properties make it a large and useful contributor to index breadth. The trade-off is mass resolution: Medutest's identity confirmation runs on a single-quadrupole instrument at unit resolution, which is adequate for confirming that a 4,113 Da species is present and inadequate for distinguishing species that differ by 1 or 2 Da.
The consequence is specific and the index enforces it. For the compound pairs where a small mass difference is the whole question — bremelanotide vs melanotan II (1 Da), hexarelin vs GHRP-6 (14 Da), reduced vs oxidised cyclic peptides (2 Da), deamidated vs parent (1 Da) — a Medutest identity confirmation is recorded as "consistent with" rather than "confirmed", and the record page states which alternative species were not excluded. This is not a criticism of the laboratory; it is a description of what a unit-resolution instrument can and cannot do.
Measured bias is +0.08 pp on 166 paired comparisons, with the widest limits of agreement of the three high-volume labs at ±0.52 pp. The 25-minute gradient is at the index's minimum acceptable length for the acylated incretins.
Methods offered
What a laboratory can measure decides what a record can establish. A submission that orders only purity produces a record that names nothing.
- RP-HPLC purity (%area, 220 nm)
- LC-MS identity (single-quadrupole, unit resolution)
- Karl Fischer water
- appearance and reconstitution assessment
- endotoxin by gel-clot LAL
What this laboratory has measured
| Compound class | Reports | Median purity | Method suitability |
|---|---|---|---|
| Incretin analogues and co-agonists | 301 | 98.65 | ADEQUATE |
| Growth-hormone axis peptides | 195 | 99.19 | ADEQUATE |
| Tissue-repair and immunomodulatory peptides | 149 | 99.28 | ADEQUATE |
| Neuroactive and cognitive peptides | 57 | 99.63 | ADEQUATE |
| Metabolic and mitochondrial peptides | 53 | 99.19 | ADEQUATE |
| Non-peptide adjuncts | 52 | 99.59 | ADEQUATE |
| Short bioregulator peptides | 50 | 99.47 | ADEQUATE |
| Melanocortin-receptor peptides | 44 | 99.17 | ADEQUATE |
| Hypothalamic and posterior-pituitary hormones | 33 | 99.40 | ADEQUATE |
| Most-tested compounds here | Reports | Median purity |
|---|---|---|
| Semaglutide | 106 | 98.89 |
| Tirzepatide | 89 | 98.48 |
| BPC-157 | 75 | 99.21 |
| Retatrutide | 65 | 98.36 |
| Ipamorelin | 36 | 99.38 |
| TB-500 | 35 | 99.79 |
| GHRP-6 | 35 | 99.56 |
| CJC-1295 (no DAC) | 32 | 99.28 |
| Semax | 31 | 99.66 |
| IGF-1 LR3 | 28 | 98.50 |
| SS-31 (Elamipretide) | 21 | 99.69 |
| L-Glutathione (reduced) | 20 | 99.35 |
| MK-677 (Ibutamoren mesylate) | 20 | 99.61 |
| PT-141 (Bremelanotide) | 19 | 99.00 |
| Epitalon | 19 | 99.71 |
| CJC-1295 with DAC | 17 | 99.09 |
Agreement with the other laboratories
Each row is a paired analysis: batches where this laboratory and another one both assayed the same physical lot. A difference on a matched pair is bias plus noise, and it is the only clean way to compare laboratories.
| Against | Paired lots | Mean difference (pp) | 95 % limits of agreement | Within 0.5 pp |
|---|---|---|---|---|
| Janoshik | 495 | +0.070 | -0.53 to 0.67 | 89% |
| PeptideMeter | 374 | +0.087 | -0.60 to 0.78 | 85% |
| VendorInvestigate | 258 | +0.212 | -0.59 to 1.02 | 73% |
| Nordanalyt | 232 | +0.017 | -0.67 to 0.70 | 86% |
| Kestrel | 187 | -0.264 | -1.23 to 0.70 | 69% |
Positive means Medutest read higher. The full paired analysis, with its assumptions →
Provenance of what this laboratory receives
A laboratory that mostly receives supplier-supplied samples produces a record set with a known upward pressure on it, however good its analysis is. This is a property of the submission channel and not of the laboratory.
| Provenance | Reports | Share | Evidentiary weight | |
|---|---|---|---|---|
| Buyer-sourced | 808 | 86.5% | Strongest available evidence in this index. | |
| Supplier-supplied | 70 | 7.5% | Weaker evidence. Read with the caveat below. | |
| Laboratory-retained | 56 | 6.0% | Provenance documented, selection uncontrolled. |